摘要
为消除射束硬化对工业CT(ComputedTomography)重建质量的影响,从多色系统参数校正算法推导出发,将多色投影数据通过多项式运算转化为单色投影数据,同时利用数字图像趋势项产生及消除的基本原理,结合小波滤波方法,提出了一种与被照射工件的材料和结构无关,而且能够适用于整个工业射线能量使用范围的综合校正方法,并给出了获得多色系统参数的实验方法.用该方法对受硬化影响的模拟图像及实际图像进行硬化校正,结果表明改方法不需要准确的先验知识且校正效果良好,具有通用性.
To remove the influence of beam-hardening on the quality of industrial CT(Computed Tomography) reconstruction, a new correction method was put forward. The correction algorithm using polychromatic system parameters was firstly deduced and the polychromatic projection was transformed to a monochromatic projection using the polynomial calculation. Based on the producing and removing of the image trend, a integrative correction method combining with wavelet filtering and polychromatic system parameters was presented, which is independent of the material and structure of workpieces and applicable for the all ranges of industrial x-ray energy. The experimental method to obtain the polychromatic system parameters was also introduced. The hardening correction method was used in the simulative and practical reconstructive images influenced by hardening, and the results showed that the better effect could be obtained, without prior knowledge and the method is of universality.
出处
《测试技术学报》
EI
2005年第1期52-56,共5页
Journal of Test and Measurement Technology
基金
国家自然基金资助项目(60372073)
山西省自然基金资助项目(20020701ZX)
